Query Mode With Required Fields

Hi Gurus,
I have to configure a form applet with 3 fields (let's say A1, A2, A3).
A1 has to always be a required field, A2 and A3 have to be required but it's not necessary both of them are required at the same time.
I've tried making field A1required by BC, then using field user prop Required, but neither of them worked.
Can anybody help me with this requirement?
Thanks in advance!

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